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Studies on estimating the performances of impellers with cut down of the blade edge of centrifugal pumps by the surface singularity method

Authors :
Cheng Ci-Chang
Takamatsu Yasuo
Furukawa Akinori
Source :
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B. 55:1595-1599
Publication Year :
1989
Publisher :
Japan Society of Mechanical Engineers, 1989.

Abstract

Pump performance depends on the outlet flow of the impeller. A method of surface singularities for core flow in the centrifugal impeller, combined with an integral method for a boundary layer, would explain the mechanism of the performance change with cutting the outlet edge of the impeller blades down. This method is applied to flows in the impellers with various cut downs of the blade edge, and then the calculated results are compared with the experimental ones. Both results are shown to be in quantitatively good agreement. On the influence of cutting the blade edge on the outlet flow, it is indicated that the cut of the pressure surface results in the decrease of relative flow angles with the decrease of radial velocity in the core flow, while that of the suction surface results in only decrease of the radial velocity. The change of the flow separation region due to the cut on the suction surface, however, combines to cause the pump performance to deteriorate.

Details

ISSN :
18848346 and 03875016
Volume :
55
Database :
OpenAIRE
Journal :
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
Accession number :
edsair.doi...........2f0bd93d6abeb89cc1133ec6416b2866
Full Text :
https://doi.org/10.1299/kikaib.55.1595